<?php
namespace objectpool;

class ObjectA
{
    private $createTime;
    public function __construct()
    {
        $this->createTime = microtime(true); //微秒，带true时，返回一个浮点数，否则返回一个字符串
    }

    public function test() 
    {
        echo "我是一个测试~{$this->createTime}\n";
    }

}